CHELONIA. 



Order CHELONIA. Tortoises and Turtles 



GENERAL CHARACTERS. The broad trunk is encased in 

 bones which form a dorsal and a ventral shield^ within the 



FIG. 329. External appearance of tortoise. 



PMX 



FIG. 330. Skull of turtle. 



S.G.. supra-occipital; PAR., parietal; FR., frontal ; P.F., pre- 



surangular. 



shelter of which the head and neck, tail and limbs^ can be 

 more or less retracted. The dorsal carapace is usually formed 



